IEM Antenna

[bamba]

I have recently purchased a Sennheiser EW300 G3 System, (rack of 4). it has only one A1031U (Omni Paddle) coming with the Rack though.

 

Should I invest in another A1031U? Or is the benefit not worth the extra cost? The rack has an AC3 in it so patching isn't a problem.

 

Hope that you can enlighten me!

[Stuart91]

You only need one single aerial to transmit the signal to the IEMs.

 

Receivers often use two aerials in a diversity configuration, so that if signal to one drops out it can switch to the other. This doesn't work for transmitters - two aerials transmitting on the same frequency would only cause problems.

[bamba]

You only need one single aerial to transmit the signal to the IEMs.

 

Receivers often use two aerials in a diversity configuration, so that if signal to one drops out it can switch to the other. This doesn't work for transmitters - two aerials transmitting on the same frequency would only cause problems.

 

Brilliant.. Thanks for this. Does this mean that the body packs are non-diversity?

[carlskeats]

You only need one single aerial to transmit the signal to the IEMs.

 

Receivers often use two aerials in a diversity configuration, so that if signal to one drops out it can switch to the other. This doesn't work for transmitters - two aerials transmitting on the same frequency would only cause problems.

 

Brilliant.. Thanks for this. Does this mean that the body packs are non-diversity?

 

At this level yes it is not diversity reciever on the IEM beltpack. You would nee to look at a product such as Shure PSM1000 for Diversity on the packs.

[Stuart91]

Does this mean that the body packs are non-diversity?

 

I vaguely remember that they do some diversity style trick using the screen of the headphone cable.

 

But it's of limited use because the physical separation, by definition, can't be particularly large.

[paulears]

Has your rack got a combiner in it? The AC-3, for example? Assuming it has one, then your 4 transmitters just need one aerial - and signal strength is usually fine and the G3 is diversity, while the G2 isn't. It does indeed use the headphone cable as one of the aerials - which works pretty well actually.

[nb705]

With a couple of notable exceptions, Diversity is for Recievers, not for transmitters.

 

 

Brilliant.. Thanks for this. Does this mean that the body packs are non-diversity?

[david.elsbury]

Indeed, and we have also been talking about iem packs ...which are recievers ;)

[Mr.X]

At this level yes it is not diversity reciever on the IEM beltpack. You would nee to look at a product such as Shure PSM1000 for Diversity on the packs.

The EK 300-IEM G3 receivers ARE diversity.

http://en-de.sennhei...m-ew-300-iem-g3

[paulears]

I'm interested in the notion somebody makes a diversity transmitter - two separate signals on the same frequency just doesn't work, and using two separate channels is extremely wasteful. I didn't realise anyone made such a pointless product - who are the two exceptions? Diversity is also a receiver function, so it would need another name 'bi-versity?'

[dbuckley]

I'm interested in the notion somebody makes a diversity transmitter - two separate signals on the same frequency just doesn't work...

Well, yes it does; called synchronous transmission or simulcasting, multiple transmitters, same frequency, phase (ie time) aligned in the overlap reception area. Now widely used by DTV and the like, it has previously been used with FM radio and wide area walkie talkie comms, but its a bit of a specialist technique, can't see much point on a stage sized area. Tim "the Toolman" Taylor understood this perfectly; just use more power on the transmitter!